论文标题
IRDC G333.73+0.37的新证据：碰撞丝状云，集线器丝系统和嵌入式核心
New evidences in IRDC G333.73+0.37: colliding filamentary clouds, hub-filament system, and embedded cores
论文作者
论文摘要
为了揭示恒星形成过程，我们提出了一项多尺度和多波长的研究，对丝状红外云（IRDC）G333.73+0.37进行了多尺度和多波长研究，该研究在其中心设有以前已知的两个HII区域。每个HII区域都与中红外源相关，并受到巨大的OB星的激动。使用Spitzer 8.0 $μ$ M图像研究了两个与一个HII区域相关的丝状结构和一个与一个HII区域相关的枢纽丝系统（HFS）。 $^{13} $ co（j = 2-1）和c $^{18} $ O（j = 2-1）线数据显示两个速度组件（左右$ -35.5和$ - $ 33.5 km s $^{ - 1} $）朝向IRDC，有利于在不同velocities处有两个FilammentAry Clouds。使用C $^{18} $ O线数据在IRDC中描绘了非热（或湍流）动作。使用IRDC中VVV近红外数据痕迹的近红外数据痕迹鉴定的年轻恒星对象（YSO）的空间分布。使用ALMA 1.38 mm连续图鉴定出低质量核心对两个HII区域。 VLT/NACO自适应l $^{\ prime} $ - 频段图像显示了至少三个类似点的来源，并且在YSOS NIR31和MIR 16附近的Inner 4000 Au中没有小规模的特征，位于HII区域。观察到HII区域和YSO组朝向IRDC的中央部分，其中两个丝状云相交。 IRDC中云云碰撞或融合流的场景似乎适用，这可以解释包括HFS和大型恒星在内的星形形成活动。
To unravel the star formation process, we present a multi-scale and multi-wavelength study of the filamentary infrared dark cloud (IRDC) G333.73+0.37, which hosts previously known two HII regions located at its center. Each HII region is associated with a mid-infrared source, and is excited by a massive OB star. Two filamentary structures and a hub-filament system (HFS) associated with one HII region are investigated in absorption using the Spitzer 8.0 $μ$m image. The $^{13}$CO(J = 2-1) and C$^{18}$O(J = 2-1) line data reveal two velocity components (around $-$35.5 and $-$33.5 km s$^{-1}$) toward the IRDC, favouring the presence of two filamentary clouds at different velocities. Nonthermal (or turbulent) motions are depicted in the IRDC using the C$^{18}$O line data. The spatial distribution of young stellar objects (YSOs) identified using the VVV near-infrared data traces star formation activities in the IRDC. Low-mass cores are identified toward both the HII regions using the ALMA 1.38 mm continuum map. The VLT/NACO adaptive-optics L$^{\prime}$-band images show the presence of at least three point-like sources and the absence of small-scale features in the inner 4000 AU around YSOs NIR31 and MIR 16 located toward the HII regions. The HII regions and groups of YSO are observed toward the central part of the IRDC, where the two filamentary clouds intersect. A scenario of cloud-cloud collision or converging flows in the IRDC seems to be applicable, which may explain star formation activities including HFS and massive stars.
